Thomas & Friends S04E04 - You Can't Win

Based on the story of the same name from Duke the Lost Engine.

Holidaymakers to the Island like riding in Duke's special train "The Picnic". One evening though Duke is too ill to manage on his own, so Falcon and Stuart assist him. Stuart teases Duke about this, but Duke gets his own back on Stuart by playing a trick on him and he proves that he still has a lot of life left in him.